Pipe-bending machine



Oct. 12, 1948. A. E. PETERS 2,451,302

PIPE BENDING MACHINE Filed March 14, 1946 2 Sheets-Sheet 1 IN VEN TOR.

HTTO/F/VEKS'.

Patented Oct. 12, 1948 UNITEDSTATES PATENT OFFICE 2 Claims.

This invention relates to machines for bending pipes and while it is especially suited for use in bending short lengths of pipe, it obviously could be employed for bending pipes of any lengths.

One of the objects of the invention is to provide a machine having relatively movable supporting dies constituting rests or seats for the pipe to be bent, an intermediate or pressing die being positioned for exerting "pressure against the supported pipe at a point between the rests, this die having its working face shaped to give the proper curvature to the bend of the pipe.

Another object is to provide a machine of this character, the pressing die of which can be actuated by a hydraulic ram or the like.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings Figure 1 is a vertical transverse section through the machine, parts being broken away.

Figure 2 is a section on line 2-2 Fig. 1.

Figure 3 is a section on line 33 Fig. 1.

Referring to the figures by characters of reference I designates standards which can be formed of channeled members extended upwardly from and welded or otherwise joined to base strips 2. Lower side beams 3 are joined to the sides of the standards I by bolts 4 insertable into selected openings 5 in the sides of the channeled standards. These openings are arranged in vertical series so that it thus is possible to adjust the lower side beams upwardly or downwardly relative to the standards.

Cross bars 6 are mounted on the beams 3 and are joined to the die supporting members I of a bed frame. These members 1 are provided with longitudinal series of openings 8 and selected openings are adapted to receive stop pins 9 extending upwardly from the members 1.

Bottom forming dies I 0 are extended transversely of the gap between the members I and are provided with cross pins H overlying the members I and adapted to abut against the adjacent stop pins 9. Thus the forming dies III, a pair of which are provided, can be held against be recessed, as shown at, [2, thereby to form a seat for a pipe P to be bent.

The upper portions of the standards I are joined at their sides bytop side beams l3, on which is mounted a cross head l4 provided with a depending socket member or guide l5. A jack indicated generally at I6 is adjustably connected to the cross head by means of a screw threaded stem I1. This stem is rotatably engaged by a nut 18 swiveled on a post l9 extending from "the cross head and rotatable by means of a hand wheel 20 or the like. Thus by rotating this hand wheel the jack l6 can be quickly raised or lowered relative to the cross head and Within the guide I5.

Jack 16 has a plunger 2| which extends downwardly therefrom and to the lower end of which is detachably joined an upper forming die 22. This plunger is adapted to be directed downwardly by hydraulic pressure or other suitable means, a controlling lever for the hydraulic mechanism being indicated at 23. This hydraulic mechanism constitutes no part of the present invention because any suitable type can be utilized. It is merely necessary to utilize a hydraulically operated forming die which can be quickly adjusted bodily to raise or lower the same relative to the bed frame.

The top forming die 22 has a recess 24 providing a seat for the pipe to be bent and this recess is preferably curved in the direction of its length, as indicated in Figure 1, so as to determine the curvature of the pipe at the bend following the bending operation. Obviously the curvature of the pipe at the bend can be varied by changing the forming die 22; substituting a die having a forming surface of one configuration for another die having a forming surface of a different configuration.

In practice the forming dies Ill are positioned at a distance apart to properly support the pipe beyond the point where the bend is to be made, these forming dies It! being held against spreading movement relative to each other by the 00- operating pins 9 and H. After the proper adjustment has been effected and a die 22 of proper configuration has been placed in position, the pipe P is placed on the forming dies II]. Thereafter the jack I6 is quickly adjusted downwardly to bring the forming die 22 into contact theregenerally should :be-Jfilleiwith some material to This is a well known practice.

It has been found that after making proper adjustments of the parts the mass production of pipes of uniform configuration is Tkgreatlyili speeded.

What is claimed is:

1. In a pipe bending machme,..:a frame5=the :1

4 the pipe to the longitudinal configuration of the seat in said top forming die.

2. In a pipe bending machine, a frame including standards and connections between the standards, means for adjustably raising and lowering said connections relative to the standards, a bed frame mounted on said connections and including die supporting members each having' a longitudinal series of :apertures, stop pins resist crushing rduringw. the! bending operation. 10

insertable in any of the apertures; bottom forming dies, cross-pins projecting from the sides of the dies and non-connectedly supported for sliding and pivotal movement upon' the die supportingmembers," said stop pins being engageable by theacross-pins, whereby to limit slidable movement of" the dies away from each other, said forrnin-gc dies havingr pipe receiving seats, there ,beinga gap between the dies, a cross head 1 'mounted'on the frame, a. jack adjustably conthe?? dieftsupporting members irelative ma the standaiidsibottom formingdies, cross pi-ns' r 'car ried'iby said dies'-=a11 'd resting upori' the :die sup por ti' member's;'saidscross pinsibeing non-con neot'ed to the -diefisupporting membersg where;L:25

by to -perinit f're'epivoting: of the dies upon said members and free slidingj mbvement of 'e'ach -die relative} to said members, stop' means adjustable dapiied 'to' engage the" outer -ends ofthe 0f the disc'i supporting members hereby fizo' lini'it 'movementof :the' dies 3 away r6m each= othen "said dies ha'ving pipe re ceivirfg seat's' 'for supporting a pipe bridging the space between the-diedtan upper forming die' positi oii'd ver thes'pacebetween thebottom form ing'fdie's halving a pipe' receiving 'seat in its lower-fsurface,i-- arrdjmeanscfqrforcing the top forming tdie"against"the" supported pipe" to ,bend

nected to and suspended therefrom, and a top forming' di detachably connected tot'he'jac'k and positioned above-"th'e" gap; said top forming die? having -a seat--in :its lower'face for the' reception""-' of that portion ofzthe pipe to be beht,'*said seat"-"" being curved in the direction of its length. r ALVEE PETERSJ- REFERENCESZCITEDQ 'lheifollowing"references are of record in the? UN KSTATE'S': PATENTSv 

